( 5a b ) 64a b c 4) 20a b d 3 4 2 3 4 -2 3 5) -2 2 6) (2a bc -2 3 6 2 -1 2 3 2 7) (64a c ) 8) (25a b c ) (5a b c ) (8a c ) 2 -1 -3 3 7 4 -1 -2 3 9(a + b) (b - d) -3 3 6 2 9) (a d ) Ö 64a d 10) 81(a + b) (b - d) 2 2 (8a d ) a 2 4 7 4 -1 10